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E.  Install fuel control unit mounting nuts and washers. Tighten nuts to torque range of 70 to 90 pound-inches.
NOTE:  Nut at 9 o'clock position may be omitted to facilitate fuel control unit installation.
F.  Install control air line (compressor discharge air) to Y-fitting on fuel control unit and to T-fitting located adjacent to fuel control unit base.
G.  Connect control air line (thermostat) to Y-fitting on fuel control unit.
H.  Connect electrical plug to fuel solenoid valve and safety wire.
I.  Connect high pressure fuel line to elbow on fuel solenoid valve.
J.  Connect fuel hose to elbow on low pressure fuel filter.
NOTE:  On APU with timed acceleration fuel control unit (TAFCU), bleed preservation fluid from the fuel control unit (AMM 49-11-0/201).
K.  Pressurize fuel system and check for leaks (AMM 49-11-0/201).
L.  APUs WITHOUT ALLIEDSIGNAL SB GTCP85-49-7096; do the APU operation test - LOADED CONDITION (AMM 49-11-0/501):
(1)  
After the APU operation test, make sure the APU master switch, on the P5 forward overhead panel, is in the OFF position and attach a DO-NOT-OPERATE tag.

(2)  
Visually examine the fuel control unit for any signs of leakage:

(a)  If you found signs of leakage, repair the cause of it.
NOTE:  A fuel leakage rate of 1 drop for each minute (2.5\cc for each hour) is permitted from the fuel control unit.
M.  APUs WITH ALLIEDSIGNAL SB GTCP85-49-7096; do the APU operation test - LOADED CONDITION (AMM 49-11-0/501):
(1)  
During the APU operation, examine the fuel control unit for leakage.

(2)  
If you found leakage, repair the cause of it.

NOTE:  A fuel leakage rate of 1 drop for each minute (2.5 cc for each hour) is permitted from the fuel control unit.
597 
49-31-11 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/98 

5. Restore Airplane to Normal Configuration
A. Position lower shroud against upper shroud and close shroud latches.
CAUTION:  MAINTAIN A MINIMUM CLEARANCE OF 0.18 INCH BETWEEN ENGINE PLUMBING, FIRE DETECTOR, CLAMPS AND INSIDE SURFACE OF LOWER SHROUD.
EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
B. Disengage APU access door support rods and stow rods. Close and latch access door.
C. Close the circuit breaker on M280 module-APU accessory unit on E3-3 electronic shelf.
D. Position BATTERY switch to ON and remove placard.
597 
Aug 01/95  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  49-31-11 Page 405 

FUEL CONTROL UNIT DRIVE SHAFT SEAL – REMOVAL/INSTALLATION
1. Remove Fuel Control Unit Drive Shaft Seal
A. Remove fuel control unit. Refer to 49-31-11, Fuel Control Unit – Removal/Installation.
B. Remove retainer. Remove and discard packing. (See figure 401).
C. Remove ring and seal from retainer. Discard seal.
2. Install Fuel Control Unit Drive Shaft Seal
A. Install new seal in retainer. Secure with ring.
B. Install new packing on retainer and install on accessory drive housing.
NOTE: Use care when moving seal over drive shaft.
C. Install fuel control unit. Refer to 49-31-11, Fuel Control Unit – Removal Installation.
500 
May 15/73  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  49-31-12 Page 401 

G00194
Fuel Control Unit Drive Shaft Seal Installation  500 
49-31-12Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/73 

APU FUEL PUMP - ADJUSTMENT/TEST
1. General
A.  The purpose of the fuel pump test is to provide prompt identification of a worn or marginal fuel pump.
B.  The APU fuel pump is an integral part of the APU fuel control unit. If the fuel pump indicates a deteriorating condition, the fuel control unit must be replaced.
2.  Check APU Fuel Pump
A.  Operate APU - Engine Start Procedure (Ref 49-11-0, Maintenance Practices).
NOTE: Ensure that either an AC or DC boost pump is operating throughout this test.
B.  Allow APU to stabilize at no load condition.
C.  Observe APU generator frequency indication.
D.  Load APU (2 air conditioning packs).
E.  Observe APU generator frequency. Frequency indication must not drop more than 12 Hz from that observed in step C.
NOTE:  If AC generator frequency indicates drop of more than 12 Hz, the fuel control unit must be replaced (Ref 49-31-11).
F.  Shut down APU - Engine Shutdown Procedure (Ref 49-11-0, Maintenance Practices).
　
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